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Rate effect on lithium-ion graphite electrode performance

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Abstract

The electrochemical performance of lithium-ion graphite electrodes with particle diameter in the range of 6–44 µm was evaluated at different discharge (intercalation)/charge (deintercalation) rates (C to C/60). The electrode capacity depends on both the average particle size and rate. With a simple rate programme, the electrode performance is dependent on the cycling rate. The capacity of small graphite particles (6 µm) at C/2 rate was 80% of that achieved at C/24 rate (∼372 mAh g−1). The capacity of large graphite particles (44 µm) obtained at fast rates (C/2) was only 25% of that obtained under near-equilibrium conditions (C/24). The electrode capacity, however, is nearly independent of the charge rate when the electrode is fully intercalated using a modified rate programme containing a constant-voltage hold at 0.005 V (vs Li+/Li) for several hours. The electrochemical behaviour is related to the physicochemical properties of the graphite particles.

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Authors and Affiliations

  1. Chemistry & Materials Science Department, Lawrence Livermore National Laboratory, 94550, Livermore, CA, USA

    T. D. Tran, J. H. Feikert & R. W. Pekala

  2. Energy and Environment Division, Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA

    K. Kinoshita

Authors
  1. T. D. Tran
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  2. J. H. Feikert
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  3. R. W. Pekala
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  4. K. Kinoshita
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Tran, T.D., Feikert, J.H., Pekala, R.W. et al. Rate effect on lithium-ion graphite electrode performance. J Appl Electrochem 26, 1161–1167 (1996). https://doi.org/10.1007/BF00243741

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  • DOI: https://doi.org/10.1007/BF00243741

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